Brand New Original Safety Relay PILZ PNOZ 16SP 777073 Perfect Performance for Industrial Application

The PILZ PNOZ 16SP (Order No. 777073) is a standalone safety relay built for classic machine-safety stop functions, especially in control cabinets where you have a “mixed-voltage reality”: 110 VAC available for the safety relay supply, while the rest of the control logic and signaling often lives at 24 VDC. This specific variant is listed with U1 = 110 V AC and U2 = 24 V DC, and it supports automatic or manual reset, making it suitable for many emergency stop and guard monitoring designs where restart behavior must be controlled. 

Unlike safety controllers that rely on configuration software, the PNOZ 16SP stays in the “hardwired safety” world. That is a feature, not a limitation, when the goal is reliability, straightforward validation, and easy serviceability for maintenance teams across multiple sites.

What the 777073 Variant Is Designed For

The product description explicitly targets monitoring of E-STOP devices and safety gates, with 1- or 2-channel wiring and detection of shorts across contacts (a diagnostic feature that helps identify certain wiring faults). Output-wise, it provides 2 N/O safety relay contacts plus 2 semiconductor outputs for signaling. 

That combination tends to land well in real panels because you can do two things at once:

Technical Data Summary

Below is a spec-focused snapshot for PILZ PNOZ 16SP 777073 (values shown are from Pilz technical details for this exact product ID):

Output Behavior: What Engineers Actually Care About

When you select a safety relay, “2 N/O” is only the beginning. The more practical questions are: can it handle the loads you intend to switch, and will it behave predictably over time?

For the PNOZ 16SP 777073, Pilz lists multiple utilisation categories and example ratings, including AC1 240 V / 8 A and AC15 230 V / 5 A, plus DC1 24 V / 8 A, which are the categories typically referenced when switching contactor coils, resistive loads, and control-circuit loads. It also lists UL pilot duty C300/R300, a common shorthand for control circuit switching capability under UL conventions. 

The presence of semiconductor outputs is a quiet superpower for troubleshooting: use them to feed PLC inputs or stack lights for “safe enabled” and “fault/feedback” type signaling, while keeping the actual safety disconnection on the relay contacts. Pilz also references DC-12 for these semiconductor outputs in the technical data. 

Environmental and Compliance Notes for Panel Builders

This relay is intended for control-cabinet environments and is specified with IP40 housing protection, operating from -10 to +55 °C, and high humidity tolerance provided condensation is not permitted. These details matter in the real world because nuisance faults often come from cabinet heat, condensation, or noisy electrical environments rather than from the logic design itself. 

Pilz also references several EMC and environmental standards (including EN 60947-5-1, EN 61000-6-2, EN 61326-3-1 and climatic suitability to EN 60068-2-78), and lists cabinet-relevant insulation context such as overvoltage category III/II and pollution degree 2. 

Typical Use Cases and Wiring Concepts

PNOZ 16SP relays are commonly applied to one safety function per relay. For the 777073 variant, the documented intent focuses on emergency stop and safety gate monitoring with support for 1- or 2-channel architectures and short detection across contacts. 

Installation and Serviceability

Mechanically, the device is sized for dense cabinets: 45 mm width, 94 mm height, 121 mm depth, and it supports plug-in screw terminals (with conductor range information shown as 24–12 AWG). 

Pilz even lists an optional accessory: a set of spare plug-in screw terminals (P3 + P4), part number 374281, which is useful for maintenance teams that prefer to keep spare terminal blocks to speed replacement without rewiring a whole cabinet. 

Closing Summary

The PILZ PNOZ 16SP 777073 is a practical, safety-focused relay choice when you want:

• A hardwired safety relay for E-STOP and safety gate monitoring 

• Mixed-voltage friendliness with 110 V AC supply (U1) and 24 V DC supply (U2) 

• 2 N/O safety contacts for switching the safety power path plus 2 semiconductor outputs for diagnostics/signaling

• Cabinet-ready specs: IP40, -10 to +55 °C, and EMC references suitable for industrial environments 

For procurement or replacement, the most important detail is the exact order number: 777073 (PNOZ 16SP 110VAC / 24VDC, 2 N/O).